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add parse_trans_mod & transform example
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Ulf Wiger
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Oct 18, 2011
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add(X,Y) -> | add(X,Y) -> | ||
X + Y. | X + Y. | ||
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int() -> | |||
int. |
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-module(test_transform_mod). | |||
-export([ex1/0]). | |||
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-include("codegen.hrl"). | |||
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ex1() -> | |||
parse_trans_mod:transform_module( | |||
ex1, [fun(Fs, _Os) -> | |||
parse_trans:export_function(int, 0, Fs) | |||
end, | |||
fun transform_ex1/2], []). | |||
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transform_ex1(Forms, _Opts) -> | |||
NewF = codegen:gen_function(add, fun(A, B) -> | |||
A - B | |||
end), | |||
parse_trans:replace_function(add, 2, NewF, Forms). |
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%%============================================================================ | |||
%% Copyright 2011 Erlang Solutions Ltd. | |||
%% | |||
%% Licensed under the Apache License, Version 2.0 (the "License"); | |||
%% you may not use this file except in compliance with the License. | |||
%% You may obtain a copy of the License at | |||
%% | |||
%% http://www.apache.org/licenses/LICENSE-2.0 | |||
%% | |||
%% Unless required by applicable law or agreed to in writing, software | |||
%% distributed under the License is distributed on an "AS IS" BASIS, | |||
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||
%% See the License for the specific language governing permissions and | |||
%% limitations under the License. | |||
%%============================================================================ | |||
%% | |||
%% Based on meck_mod.erl from http://github.com/esl/meck.git | |||
%% Original author: Adam Lindberg | |||
%% | |||
-module(parse_trans_mod). | |||
%% Interface exports | |||
-export([transform_module/3]). | |||
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-export([abstract_code/1]). | |||
-export([beam_file/1]). | |||
-export([compile_and_load_forms/1]). | |||
-export([compile_and_load_forms/2]). | |||
-export([compile_options/1]). | |||
-export([rename_module/2]). | |||
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%% Types | |||
-type erlang_form() :: term(). | |||
-type compile_options() :: [term()]. | |||
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%%============================================================================ | |||
%% Interface exports | |||
%%============================================================================ | |||
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transform_module(Mod, PT, Options) -> | |||
Forms = abstract_code(beam_file(Mod)), | |||
PTMods = if is_atom(PT) -> [PT]; | |||
is_function(PT, 2) -> [PT]; | |||
is_list(PT) -> PT | |||
end, | |||
Transformed = lists:foldl(fun(PTx, Fs) when is_function(PTx, 2) -> | |||
PTx(Fs, Options); | |||
(PTMod, Fs) -> | |||
PTMod:parse_transform(Fs, Options) | |||
end, Forms, PTMods), | |||
compile_and_load_forms(Transformed, Options). | |||
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-spec abstract_code(binary()) -> erlang_form(). | |||
abstract_code(BeamFile) -> | |||
case beam_lib:chunks(BeamFile, [abstract_code]) of | |||
{ok, {_, [{abstract_code, {raw_abstract_v1, Forms}}]}} -> | |||
Forms; | |||
{ok, {_, [{abstract_code, no_abstract_code}]}} -> | |||
error(no_abstract_code) | |||
end. | |||
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-spec beam_file(module()) -> binary(). | |||
beam_file(Module) -> | |||
% code:which/1 cannot be used for cover_compiled modules | |||
case code:get_object_code(Module) of | |||
{_, Binary, _Filename} -> Binary; | |||
error -> throw({object_code_not_found, Module}) | |||
end. | |||
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-spec compile_and_load_forms(erlang_form()) -> ok. | |||
compile_and_load_forms(AbsCode) -> compile_and_load_forms(AbsCode, []). | |||
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-spec compile_and_load_forms(erlang_form(), compile_options()) -> ok. | |||
compile_and_load_forms(AbsCode, Opts) -> | |||
case compile:forms(AbsCode, Opts) of | |||
{ok, ModName, Binary} -> | |||
load_binary(ModName, Binary); | |||
{ok, ModName, Binary, _Warnings} -> | |||
load_binary(ModName, Binary) | |||
end. | |||
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-spec compile_options(binary() | module()) -> compile_options(). | |||
compile_options(BeamFile) when is_binary(BeamFile) -> | |||
case beam_lib:chunks(BeamFile, [compile_info]) of | |||
{ok, {_, [{compile_info, Info}]}} -> | |||
proplists:get_value(options, Info); | |||
_ -> | |||
[] | |||
end; | |||
compile_options(Module) -> | |||
proplists:get_value(options, Module:module_info(compile)). | |||
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-spec rename_module(erlang_form(), module()) -> erlang_form(). | |||
rename_module([{attribute, Line, module, _OldName}|T], NewName) -> | |||
[{attribute, Line, module, NewName}|T]; | |||
rename_module([H|T], NewName) -> | |||
[H|rename_module(T, NewName)]. | |||
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%%============================================================================== | |||
%% Internal functions | |||
%%============================================================================== | |||
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load_binary(Name, Binary) -> | |||
case code:load_binary(Name, "", Binary) of | |||
{module, Name} -> ok; | |||
{error, Reason} -> exit({error_loading_module, Name, Reason}) | |||
end. |